I don't know a way out of CADmep besides using search sets in Navisworks but if you use fab parts in Revit you can just assign a transparent material to insulation and that will translate into Navisworks.
Nathan Chapman
Production Manager at General Heating and Air Conditioning
Revit Architecture Certified Professional
Revit MEP Mechanical Certified Professional
Revit MEP Electrical Certified Professional
DynaFabrication Package Author
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